MySQL：根據已選行中的值選擇行

Question

我想根據已選擇的行中的值從數據庫中的連接表中選擇行。基本上，如果父級或Granparent行處於活動狀態，則還應在結果中包含子級或孫級行。

我試圖使用JOINS和UNIONS的不同組合來獲得我想要的結果而沒有成功。

這是我的數據。例如：

表1：目標 （目標可供成員設置爲目標或完成）

id | name  | parent 
--------------------------- 
A | Obj A | null 
A1 | Obj A1 | A 
A2 | Obj A2 | A 
A2-1 | Obj A2.1 | A2 
B | Obj B | null 
B1 | Obj B1 | B 
B1-1 | Obj B1.1 | B1 
C | Obj C | null 
C1 | Obj C1 | C 
C1-1 | Obj C1.1 | C1 

表2：memberObjectives （目標成員已經完成或設定爲目標）

id | objective | member | status 
----------------------------------- 
1 | A   | 001 | goal 
2 | A1  | 001 | complete 
3 | C   | 001 | goal 

期望的結果：加入兩個表，並選擇所有行的狀態是goal或complete或當父母或祖父母物鏡具有goal或complete狀態。

objective | member | name  | status 
------------------------------------------ 
A   | 001 | Obj A | goal 
A1  | 001 | Obj A1 | complete 
A2  | 001 | Obj A2 | null 
A2-1  | 001 | Obj A2-1 | null 
C   | 001 | Obj C | goal 
C1  | 001 | Obj C1 | null 
C1-1  | 001 | Obj C1.1 | null 

A2和C2都包括在內，因爲他們的父母A和C有goal和A2-1和C1-1一個狀態都包括在內，因爲他們有與goal狀態祖父母。 B及其子女和granchild目標不包括在內，因爲memberObjectives表中的B的狀態爲complete或goal。

我的最新嘗試，我知道甚至沒有接近如下：

SELECT DISTINCT mo.objective, mo.member, o.name, mo.status 
    FROM objectives AS o 
    LEFT JOIN (SELECT * FROM memberObjectives 
    WHERE member = '001') AS mo ON o.id = mo.objective 
    LEFT JOIN objectives AS o2 ON o2.id = o.parent 
    LEFT JOIN objectives AS o3 ON o3.id = o2.parent 
    GROUP BY o.id 

謝謝您可以提供任何幫助！

Answer 1

不能測試，但試試這個：

SELECT mo.objective, mo.member, o.name, mo.status 
    FROM objectives AS o 
    LEFT JOIN memberObjectives o.id=mo.objetive 
WHERE status='goal' or status='complete' 
OR o.id IN(select parent from objetives o inner join memberObjectives mo on o.parent=mo.objetive WHERE status='goal' or status='complete') 

這應該給你的狀態目標或完整和衛生組織父記錄有該記錄。我想你延伸到格蘭父親。希望能幫助到你。

Answer 2

三問你看：看FIDDLE的工作示例

，如果你可以通過ID作爲一個過濾器，然後該查詢將不正是你想要的。

SELECT t.id as objective, mo.member, t.name, mo.status from(
    SELECT * FROM objective o 
)AS t 
LEFT JOIN memberObjective mo ON mo.objective = t.id 
WHERE t.id in(SELECT objective FROM memberObjective) 
OR t.parent in(SELECT o.id FROM objective o where o.id like "%A%") 

此查詢獲取父級，但不是祖父母。

SELECT t.id as objective, mo.member, t.name, mo.status from(
    SELECT * FROM objective o 
)AS t 
LEFT JOIN memberObjective mo ON mo.objective = t.id 
WHERE t.id in(SELECT objective FROM memberObjective) 
OR t.parent in(SELECT o.id FROM objective o join memberObjective mo on mo.objective = o.id) 

此查詢得到父母和祖父母，但它並沒有過濾掉B的..還有就是在數據庫中沒有足夠的數據去添加祖父母，因爲A2僅出現兩次，你的表及其父母和身份證。

SELECT t.id as objective, mo.member, t.name, mo.status from(
    SELECT * FROM objective o 
)AS t 
LEFT JOIN memberObjective mo ON mo.objective = t.id 
WHERE t.id in(SELECT objective FROM memberObjective) 
OR t.parent in(SELECT o.id FROM objective o left join memberObjective mo on mo.objective = o.id) 
---- you could add LIMIT 4 to get the correct results but thats another semi hacky way to do it 

Answer 3

我創建了一個似乎現在工作的解決方案。它增加了幾個連接，將parentStatus和grandparentStatus列包括到每一行中。現在如果status,parentStatus或grandparentStatus是goal或complete該行包含在結果中。

的MySQL查詢的結果如下情況如下：

objective | member | name  | status | parentStatus | grandparentStatus 
------------------------------------------------------------------------------ 
A   | 001 | Obj A | goal  | null   | null 
A1  | 001 | Obj A1 | complete | goal   | null 
A2  | 001 | Obj A2 | null  | goal   | null 
A2-1  | 001 | Obj A2-1 | null  | null   | goal 
C   | 001 | Obj C | goal  | null   | null 
C1  | 001 | Obj C1 | null  | goal   | null 
C1-1  | 001 | Obj C1.1 | null  | null   | goal 

下面是MySQL查詢：

SELECT DISTINCT * FROM objectives AS o 
    LEFT JOIN (SELECT * FROM memberObjectives WHERE member = '001') 
    AS mo ON mo.objective = o.id 
    LEFT JOIN (SELECT mo2.status AS parentStatus, mo2.objective AS parentObjective 
    FROM memberObjectives AS mo2 
    LEFT JOIN objectives AS o2 ON o2.parent = mo2.objective 
    WHERE mo2.member = '001') 
     AS parent ON parent.parentObjective = o.parent 
    LEFT JOIN (SELECT mo3.status AS grandparentStatus, mo3.objective AS grandparentObjective 
    FROM memberObjectives AS mo3 
    LEFT JOIN objectives AS o3 ON o3.parent = mo3.objective 
    WHERE mo3.member = '001') 
     AS grandparent ON grandparent.grandparentObjective = o.parent 
    WHERE mo.status = 'goal' OR mo.status = 'complete' 
    OR parentStatus = 'goal' OR parentStatus = 'complete' 
    OR grandparentStatus = 'goal' OR grandparentStatus = 'complete' 
    GROUP BY o.id 

根據我原來的問題的解決方案是不是根據已經選擇的行中的值選擇一行，而是將表連接到具有額外列以檢查來自其他行的必要值的表。